The WUSCHEL-related homeobox (WOX) transcription factor plays a vital role in stem cell maintenance and organ morphogenesis, which are essential processes for plant growth and development. , , and are valued for their ornamental and medicinal properties. However, the specific functions of the WOX gene family in species are not well understood. In our study, a total of 30 WOX genes were present in the genomes of the three species (nine DchWOXs, 11 DhuWOXs, and ten DnoWOXs). These 30 WOXs were clustered into ancient clades, intermediate clades, and WUS/modern clades. All 30 WOXs contained a conserved homeodomain, and the conserved motifs and gene structures were similar among WOXs belonging to the same branch. and had one pair of fragment duplication genes and one pair of tandem duplication genes, respectively; had two pairs of fragment duplication genes. The -acting regulatory elements (CREs) in the WOX promoter region were mainly enriched in the light response, stress response, and plant growth and development regulation. The expression pattern and RT-qPCR analysis revealed that the WOXs were involved in regulating the floral organ development of . Among them, the high expression of suggests that it might be involved in controlling lip development, whereas might be involved in controlling ovary development. In conclusion, this work lays the groundwork for an in-depth investigation into the functions of WOX genes and their regulatory role in species' floral organ development.